What would make all 4 wheel brakes lock up at the same time in a 1991 Camaro RS?

1991 Camaro RS. I purchased as a "roller". After much work, I got the engine running again. Then when I drove it for about a 1/4 mile to test it, the brakes on all 4 wheels locked up. I had parked it in the driveway and was going to left my wife try it out. She got in it and it wouldn't hardly move. I couldn't even push it with it in neutral. What would cause all the brakes to lock up, all at once?

2 Answers

How long did the car sit before you bought it? the proportioning valve
may be messed up. Pull the wheels to see if the calipers are clamped
down, crack open the bleeder and give the caliper a good smack to see
if that breaks it loose, also check the condition of the brake lines, you
may be replacing all of it.

There could be too much moisture in the brake system from sitting and
when you started to drive it the moisture started to turn to steam and
applied the brakes, once it cools down the brakes should release, try
completely flushing the system but if it has started any corrosion in the
system you will be replacing everything sooner or later. HTH

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